Re: [Phys-l] About drinkable water resistivity

[ludwik kowalski <kowalskil@mail.montclair.edu>]

On Jul 4, 2008, at 8:13 AM, CARABAJAL PEREZ, MARCIAL ROBERTO wrote:

> Hello:
>
> I would appreciatte  that you commented about an experiment we did
> trying to show common water resistivity. We submerge both analog
> multitester testing probes in a plastic recipient (5 litres) full with
> water and we obtained a reading near 15000 ohms. The measure was
> repeated with different low current densities.
> We observe that inside tank limits, resistivity practically didn't  
> vary
> with distance among probes. What could be an acceptable model to  
> explain
> this ?.  Can we make relations with measuring earth resistivity  
> problem
> ?
>
> My best regards.
> Roberto


What fraction of your 15000 ohms reading is due to water and what  
fraction is due to what happens at the interfaces (contact areas  
between water and your metallic probes)?

Ludwik Kowalski, a retired physics teacher
5 Horizon Road, Apt. 2702, Fort Lee, NJ, 07024, USA
Also an amateur journalist at http://csam.montclair.edu/~kowalski/cf/